Stockholders' Equity - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended
Apr. 30, 2020	Apr. 30, 2019	May 31, 2018
Class of Stock [Line Items]
Cost of repurchases	$ 0	$ 25,400,000
Shares repurchased and retired (shares)	0.0	0.3
Average cost per share (usd per share)	$ 0	$ 93.77
2018 Share Repurchase Program
Class of Stock [Line Items]
Repurchase program authorized amount			$ 1,000,000,000.0
Repurchase program authorized amount, remaining	$ 471,600,000

Stock repurchased and retired during period average cost per share.

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The cash outflow to reacquire common stock during the period.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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